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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) - USD ($)
 12 Months Ended
Apr. 01, 2015
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Dec. 31, 2017
Accounting Policies [Line Items]          
Impairment charge with respect to leasehold improvements and furniture and fixture   $ 7,884,000 $ 10,480,000    
Goodwill written off   $ 716,000      
Additional diluted common shares included in diluted net income per share   930,000 1,086,000 1,184,000  
Selling, general and administrative expenses   $ 855,247,000 $ 704,436,000 $ 628,762,000  
Retained earnings   $ 674,542,000 $ 612,418,000    
Stock split of common stock two-for-one        
Anti-dilutive shares excluded from diluted net income per share calculation   466,000 384,000 165,000  
Common stock issued in connection with exercise or vesting of equity awards   201,968 194,618 270,630  
Treasury shares re-issued in connection with the exercise or vesting of equity awards   270,083 291,181    
Prepaid advertising   $ 9,700,000 $ 7,800,000    
Percentage of estimated forfeiture rate for equity award compensation   0.00%      
Kingdom Holding 1 BV ("KH1")          
Accounting Policies [Line Items]          
Percentage of ownership interest (G III owns)   19.00%      
Furniture and fixtures | Wilsons, G H Bass And Vilebrequin Stores          
Accounting Policies [Line Items]          
Impairment charge with respect to leasehold improvements and furniture and fixture   $ 6,500,000 10,500,000    
Furniture and fixtures | Bon Ton Stores          
Accounting Policies [Line Items]          
Impairment charge with respect to leasehold improvements and furniture and fixture   $ 738,000      
LVMH Note          
Accounting Policies [Line Items]          
Debt instrument interest rate   2.00%      
Debt discount   $ 40,000,000      
Effects of Recently Issued Accounting Pronouncements          
Accounting Policies [Line Items]          
Additional diluted common shares included in diluted net income per share   207,000      
ASU 2014-09          
Accounting Policies [Line Items]          
Cooperative advertising   $ 28,200,000      
KL North America BV ("KLNA") | Equity method of accounting          
Accounting Policies [Line Items]          
Percentage of ownership interest (G III owns)   49.00%      
Wholesale shipping and handling costs          
Accounting Policies [Line Items]          
Selling, general and administrative expenses   $ 120,200,000 $ 99,100,000 $ 83,000,000  
Minimum          
Accounting Policies [Line Items]          
Intangible assets, estimated useful lives   5 years      
Minimum | ASU 2014-09          
Accounting Policies [Line Items]          
Retained earnings         $ 39,000,000
Minimum | Restricted Stock Units (RSUs) | Long-Term Incentive Stock Plan          
Accounting Policies [Line Items]          
Vesting and exercise period of awards   3 years      
Maximum          
Accounting Policies [Line Items]          
Intangible assets, estimated useful lives   17 years      
Maximum | ASU 2014-09          
Accounting Policies [Line Items]          
Retained earnings         $ 45,000,000
Maximum | Restricted Stock Units (RSUs) | Long-Term Incentive Stock Plan          
Accounting Policies [Line Items]          
Vesting and exercise period of awards   5 years      
Maximum | Stock Options          
Accounting Policies [Line Items]          
Vesting and exercise period of awards   10 years